On my 91 dx with a y7 and si tranny when I drive it for awhile it will run like normal but just out of no where and very randomly it will lose power if under 4 rpm after it reaches 4rpm it starts to run a lil normal but if it goes back under then it loses power and backfires at times while still driving it if I shut it off for a couple of seconds and turn the key and drop it into gear it will reset and drive like normal again does anyone know why this is happening it's really annouying